C.
i
r
L.
c
r
C
I
I.
c
I
i-
L
c
L
c
L
n
8.
COMMUNICATIONS
USING
DEDICATED PROTOCOLS
MELSEC-A
'OINTS
I
(1)
To designate the
bit
device ranges
in
units of words, the bit device
number must be a multiple of
16.
For special relays
M,
whose device number is
M9000
or greater,
designation is possible by using
"9000
+
multiples of
16".
(2)
Although the ranges are designated for
M,
L,
and
S,
if the range for
M
is designated by
L
or
S,
the same processing occurs. This is also true
for the ranges for
L
and
S.
(3)
The ranges of special relays
(M9000
to M9255) and special registers
(D9000 to 09255) are divided into the areas for read only, write only,
and system use.
Trying to write data to the ranges outside the write-only area might
cause the PC CPU to malfunction.
The ACPU programming manual gives details concerning special
relays and special registers.
(4)
When using an extension file register to read/write file register data
fromho a PC CPU, use the commands explained
in
Section
8.8
for file
register
(R)
read/write operations, use the commands explained
in
Section
8.8
for read and write operations for the file register
(R).
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